14. If participating in sexual activity that could lead to pregnancy, female study patients must use at least one form of contraception, which could consist only of a barrier method. All patients must continue to use contraception for 6 weeks after stopping the study medications. Acceptable methods of contraception include: condoms (male or female) with or without spermicidal agent, diaphragm or cervical cap with spermicide, or IUD. Female volunteers not of reproductive potential are not required to use contraception.